No mobile connection - how do I completely wipe and restore the OS the PP came with?

My Passport won't get a mobile connection. I turned it off one time and after that there has been no way to get it to connect to my carrier. The phone has been back to BB for repair and it was returned to me in working order. Now that I've reloaded my backup, and turned it off for the night, again no 4G connection.

"Security wipe / reload device software" does nothing. How do I manual completely wipe the phone blank and reload the OS my phone came with out of the box originally?